Question

A notebook costs $2.65 when the CPI is 182. In 1983, how many notebooks could you buy with $18?

a.
twenty
b.
fifteen
c.
twelve
d.
six

Answer 1

Option C -12

Explanation:

Given : A notebook costs $2.65 when the CPI is 182.

To find : In 1983, how many notebooks could you buy with $18?

Solution :

The formula of CPI is

`CPI=\frac{\text{Cost of nb in given year}}{\text{Cost of nb in base year}}* 100`

Let n number of notebooks buy.

A notebook costs is $2.65.

The cost of n notebook is 2.65n.

The cost of notebook in base year is $18

CPI=182

Substitute all the values,

`182=(2.65n)/(18)* 100`

`n=(182* 18)/(2.65* 100)`

`n=(3276)/(265)`

`n=12.3`

Approximately, The number of notebooks are 12.

Therefore, Option C is correct.